From nobody Sun Nov 24 04:32:17 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=cloud.com ARC-Seal: i=1; a=rsa-sha256; t=1728980760; cv=none; d=zohomail.com; s=zohoarc; b=f8DWXI/vvp3jakxKOeEYyzqRe5XORvDocoD//8QtVCJ+69VsbTF/ClfmcXe7kJbd+jCwEOIhIY4OAdiJKDVC7cAF9avENGj4RSsohL7Pcnf0Coft9ZplXi0YCFtxJuUfk55Ajk5iok4l3WMZUSdQAbhNrcEkdfd2XP3ktLSNSe4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1728980760; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=bVfzz9tu1frx+8mGc1UmEwEmJdo4wen9lvWfIRZy8KE=; b=QVvULl7E6STykw2Oiufga4gCc+kApPtVgUA0vWbr2Y+6hntNe5L553zs+D9IadgTPpPvF2HrJfkyLIX3oUPX7mpLoT2PweEPkJSjhgo4tpunGjlgf7gK2Ychr/VihytHDujJpmg06u9nNXFMEzVGqmGCH94VhMJR19c6WYhikx4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=reject dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1728980760890140.16213195712487; Tue, 15 Oct 2024 01:26:00 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.819029.1232323 (Exim 4.92) (envelope-from ) id 1t0cry-0003f3-Hw; Tue, 15 Oct 2024 08:25:30 +0000 Received: by outflank-mailman (output) from mailman id 819029.1232323; Tue, 15 Oct 2024 08:25:30 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t0cry-0003ew-Cb; Tue, 15 Oct 2024 08:25:30 +0000 Received: by outflank-mailman (input) for mailman id 819029; Tue, 15 Oct 2024 08:25:29 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t0crx-0003em-65 for xen-devel@lists.xenproject.org; Tue, 15 Oct 2024 08:25:29 +0000 Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [2a00:1450:4864:20::529]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 080b3b3c-8acf-11ef-a0be-8be0dac302b0; Tue, 15 Oct 2024 10:25:27 +0200 (CEST) Received: by mail-ed1-x529.google.com with SMTP id 4fb4d7f45d1cf-5c97cc83832so2270007a12.0 for ; Tue, 15 Oct 2024 01:25:27 -0700 (PDT) Received: from fziglio-desktop.. ([185.25.67.249]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9a29749663sm41590566b.64.2024.10.15.01.25.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Oct 2024 01:25:25 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 080b3b3c-8acf-11ef-a0be-8be0dac302b0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1728980726; x=1729585526; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=bVfzz9tu1frx+8mGc1UmEwEmJdo4wen9lvWfIRZy8KE=; b=XztDqHtfMwHXOFbtWmQC0gVdte+4EmONZqY0I0yfX2TnpT1g1tR0QEKNHZTWZw4Wqs VIvBqVe7J60ZKfTxnxGLOpfIOP/ojqPbxdryLPfO2LOJV84nerfni1FVuaeTH0obzag+ EMqKBAl/x2G6AATDTEfGmc1iXvURVc12gFF8Q= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728980726; x=1729585526; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=bVfzz9tu1frx+8mGc1UmEwEmJdo4wen9lvWfIRZy8KE=; b=nX/vnWtotpVVisxtBxVENAjN+RiMuQqMm+cSjMGG3guaXwXXFnKpvGY9Ggs6VOYPTa /khcHKxjfz9h+SVYMLEXRf7yzteUnBKi4C3DC1vfGWTd8NFxy57LHJxmO4T6D7wJJXQL S0Z3zL6HJ6Xz+X3t4tzVp/XzUlaiJhDypvD1j/Z5V6yuaUQH+8VkNuSoiPFxKlytD3W8 Goqn5UgFzkDWFESPy6arLwFJrp9jw5XX6i4aTyHHG0qxxBT77A2Q/pdGaFcjt7xDxxPY aoqmpA5htjJDYQqXwI51VsK4X0maWdeWIvJtoCaf+fnqwRAHBV3oHJHwuhVVzGgbkEqc zmPA== X-Gm-Message-State: AOJu0YzCOPb/1vvirc5ojL0VX7A+KGXPQEmI7M3WBa82SmVCpNBDmJKU pk9x+bxFOlvToUt2nkfkw+0ExMK2mpUKsjMdMNi7L+pkUK4v9wpXnVzXRKSvjr6gk33/BvmzWtK R X-Google-Smtp-Source: AGHT+IGKa81QccbMlNajkjv7kazsBkfOAArMnAM0d0M/FBsLRI3BmxYrhvk67/BP07W5olX5S0nv1g== X-Received: by 2002:a17:907:2ce6:b0:a99:ff70:3abd with SMTP id a640c23a62f3a-a99ff703c38mr594417966b.31.1728980726242; Tue, 15 Oct 2024 01:25:26 -0700 (PDT) From: Frediano Ziglio To: xen-devel@lists.xenproject.org Cc: Frediano Ziglio , "Daniel P. Smith" , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v10 2/2] x86/boot: Improve MBI2 structure check Date: Tue, 15 Oct 2024 09:25:13 +0100 Message-Id: <20241015082513.2477806-3-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241015082513.2477806-1-frediano.ziglio@cloud.com> References: <20241015082513.2477806-1-frediano.ziglio@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1728980761999116600 Content-Type: text/plain; charset="utf-8" Tag structure should contain at least the tag header. Entire tag structure must be contained inside MBI2 data. Signed-off-by: Frediano Ziglio Reviewed-by: Jan Beulich --- Changes since v6: - compare against total_size every time to avoid overflows. Changes since v7: - check for tag type being MULTIBOOT2_TAG_TYPE_END before checking tag size. This allows caller to not fill full tag (type field is before size field). Changes since v9: - fixed tag order. --- xen/arch/x86/efi/mbi2.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/efi/mbi2.c b/xen/arch/x86/efi/mbi2.c index 55a1777483..d2f0f0ee61 100644 --- a/xen/arch/x86/efi/mbi2.c +++ b/xen/arch/x86/efi/mbi2.c @@ -13,6 +13,7 @@ efi_multiboot2_prelude(uint32_t magic, const multiboot2_f= ixed_t *mbi) EFI_HANDLE ImageHandle =3D NULL; EFI_SYSTEM_TABLE *SystemTable =3D NULL; const char *cmdline =3D NULL; + const void *const mbi_raw =3D (const void *)mbi; bool have_bs =3D false; =20 if ( magic !=3D MULTIBOOT2_BOOTLOADER_MAGIC ) @@ -21,8 +22,10 @@ efi_multiboot2_prelude(uint32_t magic, const multiboot2_= fixed_t *mbi) /* Skip Multiboot2 information fixed part. */ tag =3D _p(ROUNDUP((unsigned long)(mbi + 1), MULTIBOOT2_TAG_ALIGN)); =20 - for ( ; (const void *)tag - (const void *)mbi < mbi->total_size && - tag->type !=3D MULTIBOOT2_TAG_TYPE_END; + for ( ; (const void *)(tag + 1) - mbi_raw <=3D mbi->total_size && + tag->type !=3D MULTIBOOT2_TAG_TYPE_END && + tag->size >=3D sizeof(*tag) && + (const void *)tag + tag->size - mbi_raw <=3D mbi->total_size; tag =3D _p(ROUNDUP((unsigned long)tag + tag->size, MULTIBOOT2_TAG_ALIGN)) ) { --=20 2.34.1